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New aspects of globularization crystallography and dynamic phase evolution during thermomechanical processing of Ti���6Al���4V alloy
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP, Materials chemistry and physics 276, 125388 (2022). doi:10.1016/j.matchemphys.2021.125388
- Publication Year :
- 2022
- Publisher :
- Deutsches Elektronen-Synchrotron, DESY, Hamburg, 2022.
-
Abstract
- Materials chemistry and physics 276, 125388 (2022). doi:10.1016/j.matchemphys.2021.125388<br />Microstructural and crystallographic aspects arising from thermomechanical processing of a Ti���6Al���4V alloy in ��and ��+�� phase fields were studied by electron backscatter diffraction and both conventional and high energysynchrotron X-ray diffraction. The impact of deformation in the single �� field on the final microstructure has beenacknowledged by an increase of the retained �� phase content and decrease of martensitic c/a ratio with thereduction of strain rate, although no significant influence of strain rate on the well-defined fiber texture of ����� hasbeen observed. During deformation in the ��+�� field, texture weakening has been observed, and misorientationangle/axis distribution analysis has evidenced randomization and loss of the Burgers orientation relationshipbetween �� and �� upon globularization. The behavior of deformed �� lamellae in the ��+�� field was also evaluatedin terms of internal misorientation spread and lattice rotation around the deformation axis, corroborating thatglobularization takes place through dynamic recrystallization, boundary splitting and shearing. Globularizedgrain size was shown to be exponentially proportional to strain rate decrease. Lower strain rates in the ��+�� fieldalso increase the �� phase fraction and decrease the c/a ratio of the �� phase, leading to values closer to the idealone for titanium. However, an excessive amount of �� causes its instability during quenching, resulting in itsdecomposition into secondary �� during cooling.<br />Published by Elsevier, New York, NY [u.a.]
- Subjects :
- Shearing (physics)
MATERIAIS
Materials science
Misorientation
Strain rate
Condensed Matter Physics
Condensed Matter::Materials Science
Crystallography
Dynamic recrystallization
Thermomechanical processing
ddc:530
General Materials Science
Texture (crystalline)
Deformation (engineering)
Electron backscatter diffraction
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP, Materials chemistry and physics 276, 125388 (2022). doi:10.1016/j.matchemphys.2021.125388
- Accession number :
- edsair.doi.dedup.....60825d9479b31faa95a242d120e29f60
- Full Text :
- https://doi.org/10.3204/pubdb-2021-04296